This may be the bleakest forecast yet for coral reefs--researchers just concluded that the prospects for the world's coral reefs' survival are so slim that a plan must be launched to freeze samples in liquid nitrogen and preserve them for future generations.

The world's coral is dying out, due largely to rising temperatures in ocean waters. Too-warm temps cause mass bleaching in coral, which leads to widespread mortality in the reefs. And as the oceans continue to grow hotter, the coral will die at faster and faster rates.

So a meeting of researchers was held in Denmark to determine w